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  <title>Check whether this class is iterable</title>
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  <div id="layout-content"><div id="reflectionclass.isiterable" class="refentry">
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  <h1 class="refname">ReflectionClass::isIterable</h1>
  <p class="verinfo">(PHP 7 &gt;= 7.2.0, PHP 8)</p><p class="refpurpose"><span class="refname">ReflectionClass::isIterable</span> &mdash; <span class="dc-title">Check whether this class is iterable</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-reflectionclass.isiterable-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>ReflectionClass::isIterable</strong></span>(): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Check whether this class is iterable (i.e. can be used inside <a href="control-structures.foreach.html" class="link">foreach</a>).
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-reflectionclass.isiterable-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-reflectionclass.isiterable-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-reflectionclass.isiterable-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5184">
    <p><strong>示例 #1 Basic <span class="methodname"><strong>ReflectionClass::isIterable()</strong></span> Usage</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">class&nbsp;</span><span style="color: #0000BB">IteratorClass&nbsp;</span><span style="color: #007700">implements&nbsp;</span><span style="color: #0000BB">Iterator&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;function&nbsp;</span><span style="color: #0000BB">__construct</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;function&nbsp;</span><span style="color: #0000BB">key</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;function&nbsp;</span><span style="color: #0000BB">current</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">next</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">valid</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">rewind</span><span style="color: #007700">()&nbsp;{&nbsp;}<br />}<br />class&nbsp;</span><span style="color: #0000BB">DerivedClass&nbsp;</span><span style="color: #007700">extends&nbsp;</span><span style="color: #0000BB">IteratorClass&nbsp;</span><span style="color: #007700">{&nbsp;}<br />class&nbsp;</span><span style="color: #0000BB">NonIterator&nbsp;</span><span style="color: #007700">{&nbsp;}<br /><br />function&nbsp;</span><span style="color: #0000BB">dump_iterable</span><span style="color: #007700">(</span><span style="color: #0000BB">$class</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$reflection&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">ReflectionClass</span><span style="color: #007700">(</span><span style="color: #0000BB">$class</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflection</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">isIterable</span><span style="color: #007700">());<br />}<br /><br /></span><span style="color: #0000BB">$classes&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">"ArrayObject"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"IteratorClass"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"DerivedClass"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"NonIterator"</span><span style="color: #007700">);<br /><br />foreach&nbsp;(</span><span style="color: #0000BB">$classes&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$class</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Is&nbsp;</span><span style="color: #0000BB">$class</span><span style="color: #DD0000">&nbsp;iterable?&nbsp;"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">dump_iterable</span><span style="color: #007700">(</span><span style="color: #0000BB">$class</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Is ArrayObject iterable? bool(true)
Is IteratorClass iterable? bool(true)
Is DerivedClass iterable? bool(true)
Is NonIterator iterable? bool(false)
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-reflectionclass.isiterable-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="reflectionclass.construct.html" class="methodname" rel="rdfs-seeAlso">ReflectionClass::__construct()</a> - 初始化 ReflectionClass 类</span></li>
   </ul>
  </p>
 </div>


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